单项选择题 Which of the following is primarily used for VoIP?（）

多项选择题 A user in the accounting department reports that their office is able to connect to the network, but they are unable to connect to the Internet. Which of the following documentation would be the MOST useful to the administrator in diagnosing this issue?（） (Select TWO).

单项选择题 Which of the following describes 1Gigabit Ethernet?（）